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백길옥(Gil-Ok Baek),박홍근(Hong-Gun Park),문대호(Dae-Ho Mun) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Floor Impact Noise is a structure-borne noise which is mainly caused by vibration of concrete slabs. The majority of previous studies have focused on investigating performance of absorbing sheets on the reduction of floor impact noise. But absorbing sheets do not efficiently reduce heavy-weight floor impact noise level because it cannot absorb slab vibration, which is the fundamental noise source. In this study, double-floor system was developed in order to reduce floor impact noise level in residual buildings. This floor system reduces heavy-weight impact noise level by reducing vibration response at the center of slab, which has maximum amplitude in the 1st vibration mode. In order to identify the performance of the double-floor system, experiments were planned. Primary test parameters are span of double floor, arrangement and types of absorbing sheets.
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박홍근(Hong-Gun Park),백길옥(Gil-Ok Baek),문대호(Dae-Ho Moon) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Heavy-weight floor impact noise has characteristic of structure-borne noise which is caused by vibration of a slab. Thus, dynamic property of building should be measured precisely to analyze the causes of floor impact noise. In this study, modal test was performed in the range of floor and walls of residual building and modal parameters such as vibration mode, natural frequency, damping coefficient were analyzed. Also, correlation between structural vibration and sound field were investigated by floor impact noise and vibration measurement test.
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문대호,이상현,황재승,백길옥,박홍근,Mun, Dae-Ho,Lee, Sang-Hyun,Hwang, Jae-Seung,Baek, Gil-Ok,Park, Hong-Gun 한국전산구조공학회 2015 한국전산구조공학회논문집 Vol.28 No.6
본 논문에서는 유한요소법을 이용하여 공동주택의 중량충격음을 예측하기 위해 구조해석 모델과 음향해석 모델을 개발하고 예측결과와 실험결과를 비교하여 정확성을 검증하였다. 패널 임피던스 값을 사용하여 거실의 적절한 흡음 특성을 반영할 수 있었으며, 수치해석에 주파수 응답함수 특성을 적용하여 1회 수치해석만으로 다양한 충격원에 대한 응답을 예측할 수 있도록 하였다. 구조진동에 의한 실내 소음해석은 유한요소 수치해석 기법이 진동 및 음향모드에 대한 응답을 비교적 정확하게 예측할 수 있도록 하였으며, 본 연구의 예측결과는 실험결과와 비교적 유사한 값을 나타내었다. 향후 정확도가 보다 향상된 수치해석 모델개발을 통해 바닥충격음 저감에 효과적인 공동주택 설계가 가능할 것으로 판단된다. In this study floor impact noise and structure acceleration response of bare concrete slabs were predicted by using Finite Element Analysis(FEA). Prediction results were compared with experimental results to prove the accuracy of numerical model. Acoustic absorption were addressed by using panel impedance coefficients with frequency characteristics and structural modal damping of numerical model were applied by modal testing results and analysis of prediction and test results. By using frequency response function, the floor acceleration and acoustic pressure responses for various impact sources were calculated at the same time. In the FEA, the natural frequencies and the shapes of vibration and acoustic modes can be estimated through the eigen-value analysis, and it can be visually seen the vibration and sound pressure field and the contribution of major modes.
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